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MM54C90 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # MM54C90
Description  4-Bit Decade, Binary Counter
PDF  6 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

MM54C90 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Switching Time Waveforms
TLF5889 – 7
Note 1
MM54C90 MM74C90 and MM54C93
MM74C93 are solid line waveforms Dashed line
waveforms are for MM54C90MM74C90 only
Truth Table
MM54C90MM74C90 4-Bit Decade Counter
BCD Count Sequence
Count
Output
QD
QC
QB
QA
0L
L
L
L
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5L
H
L
H
6L
H
H
L
7L
H
H
H
8H
L
L
L
9H
L
L
H
Output QA is connected to Input B for
BCD count
H e High Level
L e Low Level
X e Irrelevant
ResetCount Function Table
Reset Inputs
Output
R01 R02 R91 R92 QD QC QB QA
HH
L
X
L
L
L
L
HH
X
L
L
L
L
L
XX
H
H
H
L
L
H
X
L
X
L
Count
L
X
L
X
Count
L
X
X
L
Count
X
L
L
X
Count
MM54C93MM74C93 4-Bit Binary Counter
Binary Count Sequence
Count
Output
QD
QC
QB
QA
0L
L
L
L
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5L
H
L
H
6L
H
H
L
7L
H
H
H
8H
L
L
L
9H
L
L
H
10
H
L
H
L
11
H
L
H
H
12
H
H
L
L
13
H
H
L
H
14
H
H
H
L
15
H
H
H
H
Output QA is connected to input B for
binary count sequence
H e High Level
L e Low Level
X e Irrelevant
ResetCount Function Table
Reset
Output
Inputs
R01
R02
QD
QC
QB
QA
HH
L
L
L
L
L
X
Count
X
L
Count
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